99% Invisible's host, Roman Mars, calls his podcast a tiny radio show about design, but the show's listenership is anything but small. What started as a short four and a half minute radio show on public radio is now one of the most popular podcasts on iTunes.

I talk to Roman about his early days, how the growth of his podcast audience impacted the format of the show, his use of Kickstarter and crowdfunding as an alternative to traditional public radio funding models, the show's creative process and much more. We also ask Roman what his favorite podcasts are.